Hi MSP Support,
In the Example program that uses the Chopper OpAmp to output the DAC8 to an IO pin, we noticed it floating substantially on the scope when initially run. The scope trace "settled" but it took on the order of 1/2 a second to do so. It moved almost a volt before stabilizing on the correct value set in the DAC8 register. This behavior should be easily observable on the EVM..
Is this the OpAmp or the DAC8 what is floating? IE: Is the DAC8 voltage actually moving around OR is the OpAmp moving around and the DAC8 voltage steady?
The program was unaltered from the SDK example program. We saw the same behavior in the EVM and customer board. The customer board had no external components on any of the OpAmp pins. The customer wants to know if they need to add caps to the OpAmp inputs or outputs to stabilize output. I notice the DAC8 has a register for ultra low power or High speed/High Accuracy/High current. This was not changed from the demo program.
Do we have any idea how fast the DAC8 will stabilize? The customer needs for it to hit its values quickly after bootup so the comparator has a fast referece voltage?
Thanks!
Blake
